[PvK]

Hmm. If you're going to use a modded map, one approach would be to give everyone the heroes they need there, from the start.

Otherwise, I didn't think you could mod the heroes without hijacking the existing unit numbers for a nation, which meant you needed to create new copies of their bitmaps, which I anyway found to be a big chore.

Anyway, I'd suggest the general approach that if there is something that is hard to give to a clone nation, try giving them something else that is thematic and similar but slightly different. For example, if you don't have a good way to give clone-Ermor Body Ethereal from the start, maybe let them recruit Shadow Vestals instead. Ermor seems like one of the hardest to do though because they have special spells and undead effects.

PvK